Automobile-radiator thermometer.



akmsm AUTOMOBILE RADIATOR THERMOMETER,

APPLlCATIDN FILED 3ULY Be 1914.

Patented Apr. 4, 1916.

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UNITED STATES PATENT oeeron.

EDWARD A. LARSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO STEWART-WARNER SPEED- OMETER CORPORATION, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

AUTOMOBILE-RADIATOR THERMOMET ER.

Specification of Letters Patent.

Patented Apr. 4, 1916.

Application filed July 6, 1914. Serial No. 849,073.

To all whom it may concern."

lie it known that I. llnwann A. LARSON, a citizen of the l'nited States, residing at Chicago. in the county of (ook and State of Illinois. have invented new and useful Improvements in Automobile-Radiator Thermometers. of which the following is a specification. reference being bad to the acconr panying drawings, forming a part thereof.

This invention relates to improvements in a temperature indicating device for automobile radiators designed to insure that the reading of such indicator shall correspond as closely as possible with the actual temperature of the water in the radiator.

The invention consists in the features and elements described and shown in the drawings, as indicated by the claims.

In the drawings :Figure 1 isan elevation partly in section, showing a portion of an automobile radiator having a temperature indicator mounted therein, embodying the improvement which is the subject of this invention. Fig. 2 is an enlarged detail view. principally in section.

The temperature indicator used for purposes of illustration is a metallic thermometer comprising a bi-metallic bar or heatresponsive element, 1. whose curvature is varied in a well understood manner by variations of temperature and which operates upon a push-pin, :2, to actuate mechanism not shown in detail but including an indicating needle, 3. which traverses a scale. 4, graduated in terms of temperature. For convenience and simplicity. it is considered desirable to mount this device in the usual filler cap, 5, which constitutes the closure of the neck. 6. ordinarily provided on the radiator. This positions the device where it can be easily read from the drivers seat, and in no way interferes with the water piping connections. between the radiator and the engine. By reason of the wide. variation in design of the. tiller neck (3, however, it is found that if the frame member, 7. larrying the heat-responsive element. l. is made of uniformlength, it will project into the radiator far enough in some cars to reach the cooling water therein. while in other cars, by reason of the greater lcngthof the neck, 6, it will remain above the water level in the air space, so that the heatresponsi\-'c element, 1, is not subjected directly to the temperature of the. water itself. Ordinarily the water enters from the engine near the top of the radiator by a pipe indicated by the dotted circle. 8. but even so. the temperature of the air space above this hottest water bears no uniform relation to the temperature of the water itself. To bring this hottest water closer to the heat-responsive element, 1, said element is surrounded with an upwardly-open and daring cup, 9, preferably ply of water which shall have at all times practically the same temperature .as the water in the upper portion of the radiator, which is the hottest water and which therefore most accurately registers the condition of the engine as to temperature. Under some conditions it is found desirable to protect the heat-responsive element, 1. from actual contact with the water, especially where such water is rather impure and would tend to set up electrolytic action between the two metals of the element. 1; in such instances the element. 1. may be provided with an inclosing metallic jacket, 11, which will not materially interfere with conduction of heat from the'water in the cup, 9.

I claim 1. A device for indicating the temperature of the cooling water of an internal combustion engine comprising, in combination with the cooling water system. a support adapted to be secured at an aperture leadin thereinto; a thermometer mounted on sald support with its heat-responsive clement inside and its tcmperat-ure-indicating element outside the circulator system; an upwardly open water receptacle and means for supporting it within the circulator system, the heat-responsive element of the thermometer being intruded into said receptacle. whereby it is exposed to the cooling water entering said receptacle from the circulator system, said receptacle having a leak port for the slow escape of water therefrom at the lower part.

2. A device for indicating the temperature of the cooling water of an internal co'mbustion engine, comprising, in combination 110 with a radiator, a thermometer adapted to be mounted upon the radiator cap With its heat-responsive member protruding into. the radiator through the filling mouth thereof; a heat-conducting support for said heat-1e sponsiie member; a heat-conducting jacket attached to said support which inc-loses said heat-responsive member out of direct con tact with the air which may be in the radiator above the water, and a cup into which said inclosing Jacket extends which is opened upwardly within the radiator for reception of water from the radiator to surround said inc-losing jacket, said cup hzwing" a leakport at the lower part for slow waste of 15 ater from the cup.

In testimony whereof, I have hereunto set my hand at Chicago, Illinois, this 3rd day of July, 1914.

EDWARD A. LARSON.

Witnesses:

C. B. SMITH,- H. BLIVEN. 

